Speckle interferometry of magnetic Ap/Bp stars at the BTA 6-m telescope (new binary and multiple systems)

We report the results of speckle interferometric observations of 117 Ap/Bp stars made with the 6-m telescope of the Special Astrophysical Observatory of the Russian Academy of Sciences in December 2009. We resolved 27 binary and 2 triple stars into individual components. Fourteen of these stars were astrometrically resolved for the first time. The fraction of speckle interferometric binaries in the sample of 117 Ap/Bp stars with confirmed magnetic fields is 25%. We expect that the total fraction of binaries in the sample with account for spectroscopic short-period systems and astrometric common proper motion pairs can be twice higher. (C) 2011 WILEY-VCH Verlag GmbH&Co. KGaA, Weinheim